448 lines
8.9 KiB
Go
448 lines
8.9 KiB
Go
package schema
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import (
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"bytes"
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"database/sql"
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"fmt"
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"net"
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/vmihailenco/msgpack/v5"
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"github.com/uptrace/bun/dialect/sqltype"
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"github.com/uptrace/bun/extra/bunjson"
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"github.com/uptrace/bun/internal"
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)
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var scannerType = reflect.TypeOf((*sql.Scanner)(nil)).Elem()
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type ScannerFunc func(dest reflect.Value, src interface{}) error
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var scanners []ScannerFunc
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func init() {
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scanners = []ScannerFunc{
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reflect.Bool: scanBool,
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reflect.Int: scanInt64,
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reflect.Int8: scanInt64,
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reflect.Int16: scanInt64,
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reflect.Int32: scanInt64,
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reflect.Int64: scanInt64,
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reflect.Uint: scanUint64,
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reflect.Uint8: scanUint64,
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reflect.Uint16: scanUint64,
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reflect.Uint32: scanUint64,
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reflect.Uint64: scanUint64,
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reflect.Uintptr: scanUint64,
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reflect.Float32: scanFloat64,
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reflect.Float64: scanFloat64,
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reflect.Complex64: nil,
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reflect.Complex128: nil,
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reflect.Array: nil,
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reflect.Interface: scanInterface,
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reflect.Map: scanJSON,
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reflect.Ptr: nil,
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reflect.Slice: scanJSON,
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reflect.String: scanString,
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reflect.Struct: scanJSON,
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reflect.UnsafePointer: nil,
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}
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}
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func FieldScanner(dialect Dialect, field *Field) ScannerFunc {
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if field.Tag.HasOption("msgpack") {
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return scanMsgpack
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}
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if field.Tag.HasOption("json_use_number") {
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return scanJSONUseNumber
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}
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if field.StructField.Type.Kind() == reflect.Interface {
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switch strings.ToUpper(field.UserSQLType) {
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case sqltype.JSON, sqltype.JSONB:
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return scanJSONIntoInterface
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}
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}
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return dialect.Scanner(field.StructField.Type)
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}
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func Scanner(typ reflect.Type) ScannerFunc {
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kind := typ.Kind()
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if kind == reflect.Ptr {
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if fn := Scanner(typ.Elem()); fn != nil {
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return PtrScanner(fn)
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}
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}
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switch typ {
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case timeType:
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return scanTime
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case ipType:
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return scanIP
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case ipNetType:
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return scanIPNet
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case jsonRawMessageType:
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return scanBytes
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}
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if typ.Implements(scannerType) {
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return scanScanner
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}
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if kind != reflect.Ptr {
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ptr := reflect.PtrTo(typ)
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if ptr.Implements(scannerType) {
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return addrScanner(scanScanner)
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}
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}
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if typ.Kind() == reflect.Slice && typ.Elem().Kind() == reflect.Uint8 {
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return scanBytes
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}
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return scanners[kind]
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}
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func scanBool(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetBool(false)
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return nil
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case bool:
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dest.SetBool(src)
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return nil
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case int64:
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dest.SetBool(src != 0)
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return nil
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case []byte:
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if len(src) == 1 {
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dest.SetBool(src[0] != '0')
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return nil
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}
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanInt64(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetInt(0)
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return nil
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case int64:
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dest.SetInt(src)
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return nil
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case uint64:
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dest.SetInt(int64(src))
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return nil
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case []byte:
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n, err := strconv.ParseInt(internal.String(src), 10, 64)
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if err != nil {
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return err
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}
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dest.SetInt(n)
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return nil
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case string:
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n, err := strconv.ParseInt(src, 10, 64)
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if err != nil {
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return err
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}
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dest.SetInt(n)
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanUint64(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetUint(0)
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return nil
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case uint64:
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dest.SetUint(src)
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return nil
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case int64:
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dest.SetUint(uint64(src))
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return nil
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case []byte:
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n, err := strconv.ParseUint(internal.String(src), 10, 64)
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if err != nil {
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return err
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}
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dest.SetUint(n)
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanFloat64(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetFloat(0)
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return nil
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case float64:
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dest.SetFloat(src)
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return nil
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case []byte:
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f, err := strconv.ParseFloat(internal.String(src), 64)
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if err != nil {
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return err
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}
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dest.SetFloat(f)
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanString(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetString("")
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return nil
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case string:
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dest.SetString(src)
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return nil
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case []byte:
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dest.SetString(string(src))
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanBytes(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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dest.SetBytes(nil)
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return nil
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case string:
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dest.SetBytes([]byte(src))
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return nil
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case []byte:
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clone := make([]byte, len(src))
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copy(clone, src)
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dest.SetBytes(clone)
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanTime(dest reflect.Value, src interface{}) error {
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switch src := src.(type) {
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case nil:
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destTime := dest.Addr().Interface().(*time.Time)
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*destTime = time.Time{}
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return nil
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case time.Time:
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destTime := dest.Addr().Interface().(*time.Time)
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*destTime = src
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return nil
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case string:
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srcTime, err := internal.ParseTime(src)
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if err != nil {
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return err
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}
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destTime := dest.Addr().Interface().(*time.Time)
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*destTime = srcTime
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return nil
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case []byte:
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srcTime, err := internal.ParseTime(internal.String(src))
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if err != nil {
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return err
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}
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destTime := dest.Addr().Interface().(*time.Time)
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*destTime = srcTime
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return nil
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanScanner(dest reflect.Value, src interface{}) error {
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return dest.Interface().(sql.Scanner).Scan(src)
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}
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func scanMsgpack(dest reflect.Value, src interface{}) error {
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if src == nil {
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return scanNull(dest)
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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dec := msgpack.GetDecoder()
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defer msgpack.PutDecoder(dec)
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dec.Reset(bytes.NewReader(b))
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return dec.DecodeValue(dest)
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}
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func scanJSON(dest reflect.Value, src interface{}) error {
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if src == nil {
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return scanNull(dest)
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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return bunjson.Unmarshal(b, dest.Addr().Interface())
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}
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func scanJSONUseNumber(dest reflect.Value, src interface{}) error {
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if src == nil {
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return scanNull(dest)
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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dec := bunjson.NewDecoder(bytes.NewReader(b))
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dec.UseNumber()
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return dec.Decode(dest.Addr().Interface())
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}
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func scanIP(dest reflect.Value, src interface{}) error {
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if src == nil {
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return scanNull(dest)
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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ip := net.ParseIP(internal.String(b))
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if ip == nil {
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return fmt.Errorf("bun: invalid ip: %q", b)
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}
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ptr := dest.Addr().Interface().(*net.IP)
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*ptr = ip
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return nil
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}
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func scanIPNet(dest reflect.Value, src interface{}) error {
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if src == nil {
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return scanNull(dest)
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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_, ipnet, err := net.ParseCIDR(internal.String(b))
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if err != nil {
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return err
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}
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ptr := dest.Addr().Interface().(*net.IPNet)
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*ptr = *ipnet
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return nil
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}
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func addrScanner(fn ScannerFunc) ScannerFunc {
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return func(dest reflect.Value, src interface{}) error {
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if !dest.CanAddr() {
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return fmt.Errorf("bun: Scan(nonaddressable %T)", dest.Interface())
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}
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return fn(dest.Addr(), src)
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}
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}
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func toBytes(src interface{}) ([]byte, error) {
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switch src := src.(type) {
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case string:
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return internal.Bytes(src), nil
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case []byte:
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return src, nil
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default:
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return nil, fmt.Errorf("bun: got %T, wanted []byte or string", src)
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}
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}
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func PtrScanner(fn ScannerFunc) ScannerFunc {
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return func(dest reflect.Value, src interface{}) error {
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if src == nil {
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if !dest.CanAddr() {
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if dest.IsNil() {
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return nil
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}
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return fn(dest.Elem(), src)
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}
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if !dest.IsNil() {
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dest.Set(reflect.New(dest.Type().Elem()))
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}
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return nil
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}
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if dest.IsNil() {
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dest.Set(reflect.New(dest.Type().Elem()))
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}
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return fn(dest.Elem(), src)
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}
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}
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func scanNull(dest reflect.Value) error {
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if nilable(dest.Kind()) && dest.IsNil() {
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return nil
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}
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dest.Set(reflect.New(dest.Type()).Elem())
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return nil
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}
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func scanJSONIntoInterface(dest reflect.Value, src interface{}) error {
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if dest.IsNil() {
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if src == nil {
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return nil
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}
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b, err := toBytes(src)
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if err != nil {
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return err
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}
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return bunjson.Unmarshal(b, dest.Addr().Interface())
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}
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dest = dest.Elem()
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if fn := Scanner(dest.Type()); fn != nil {
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return fn(dest, src)
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func scanInterface(dest reflect.Value, src interface{}) error {
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if dest.IsNil() {
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if src == nil {
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return nil
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}
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dest.Set(reflect.ValueOf(src))
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return nil
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}
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dest = dest.Elem()
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if fn := Scanner(dest.Type()); fn != nil {
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return fn(dest, src)
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}
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return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
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}
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func nilable(kind reflect.Kind) bool {
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switch kind {
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case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
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return true
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}
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return false
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}
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